Double hook



FIG. 1 is a perspective view of a double hook showing our design;

FIG. 2 is a front elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a top plan view; and,

FIG. 6 is bottom plan view.

The broken line disclosures in the view represents portions of the handheld shower in which the claimed design is embodied, but which forms no part of the claimed design. 

CLAIM The ornamental design for a double hook, as shown and described. 